Honda Civic. Manual — part 855

REVERSE LOCKOUT SYSTEM

GENERAL TROUBLESHOOTING INFORMATION

How to Troubleshoot Circuits at the ECM Connectors

1. Jump the SCS line with the HDS.
2. Remove the cover (A).

Fig. 2: Identifying Cover
Courtesy of AMERICAN HONDA MOTOR CO., INC.

3. Lift up the under-hood fuse/relay box (D).

NOTE:

The ECM overwrites data and monitors the EVAP system
for up to 15 minutes after the ignition switch is turned to
OFF. Jumping the SCS line after turning the ignition switch
to LOCK (0) cancels this function. Disconnecting the ECM
during this function, without jumping the SCS line first, can
damage the ECM.

2008 Honda Civic LX

2006-08 TRANSMISSION Manual Transmission (6-Speed)(Except Hybrid) - Civic

Fig. 3: Identifying Under-Hood Fuse/Relay Box And ECM Connectors
Courtesy of AMERICAN HONDA MOTOR CO., INC.

4. Remove the coolant reservoir (E). Disconnect ECM connectors A, B, and C.

5. When diagnosis/troubleshooting is done at the ECM connector, use the

terminal test port (A) above the terminal you need to check.

Fig. 4: Identifying Terminal Test Port
Courtesy of AMERICAN HONDA MOTOR CO., INC.

6. Connect one side of the patch cord (A) terminals to a commercially available

digital multimeter (B), and connect the other side of the patch cord terminals to
a commercially available banana jack (Pomona Electronics Tool No. 3563 or
equivalent) (C).

NOTE:

ECM connectors A, B and C have a symbols (A = [], B =
triangle symbol , C = o) embossed on them for
identification.

2008 Honda Civic LX

2006-08 TRANSMISSION Manual Transmission (6-Speed)(Except Hybrid) - Civic

Fig. 5: Connecting Patch Cord Terminals To Digital Multimeter
Courtesy of AMERICAN HONDA MOTOR CO., INC.

7. Gently contact the pin probe (male) at the terminal test port from the terminal

side. Do not force the tips into the terminals.

COMPONENT LOCATION INDEX

NOTE:

For accurate results, always use the pin probe
(male).

To prevent damage to the connector terminals, do
not insert test equipment probes, paper clips, or
other substitutes as they can damage the terminals.
Damaged terminals cause a poor connection and an
incorrect measurement.

Do not puncture the insulation on a wire. Punctures
can cause poor or intermittent electrical
connections.

2008 Honda Civic LX

2006-08 TRANSMISSION Manual Transmission (6-Speed)(Except Hybrid) - Civic

Fig. 6: Identifying Reverse Lockout System Component Location Index
Courtesy of AMERICAN HONDA MOTOR CO., INC.

SYSTEM DESCRIPTION

At a vehicle speed of 12 mph (20 km/h) or more, the ECM receives a signal from
the output shaft (countershaft) speed sensor and activates the reverse lockout
solenoid, which pushes select lock cam B into the locked position. As a result, the
select lever can not rotate to the reverse select position, making it impossible to
engage reverse gear. At a vehicle speed of 9 mph (15 km/h) or less, the signal from
the output shaft (countershaft) speed sensor is interrupted, the ECM turns off the
reverse lockout solenoid. The select lock return spring pulls back select lock cam B,
enabling the select lever to move freely so the reverse gear can be selected.

VEHICLE SPEED CHART

Vehicle speed

Inhibitor

Reverse selection

Above 12 mph (20 km/h)

ON

Not allowed

Below 9 mph (15 km/h)

OFF

Allowed

Ignition switch LOCK (0)

OFF

Allowed

2008 Honda Civic LX

2006-08 TRANSMISSION Manual Transmission (6-Speed)(Except Hybrid) - Civic